This is the FrostWire forum.
So are you seeing a firewall error when you try to download LW, or when LW's installed & you try to connect??
If LW's installed & won't let you connect due to a firewall, see the sticky below for help..
Connection problems? Check here first!
...& answer the questions from this thead
System details - help us to help you
Otherwise, tell us a bit more about what's happening when you try to download version 4.12.6